Well cementing apparatus



ug. 18, 1931. R. c. BAKER wELL CEMENTING APPARATUS Filed July l3 1929 Patented .ug. 1 8, 1931 UNITED s'rATEs PJATE'NT oFFic BEUBEN C. BAKER, OF COALINGA, CALIFORNIA, ASSIGNOR TC BAKEB. OIL TOOLS, INC.,

OF HUNTINGTON PARK, CALIFORNIA, A CORPORATION OF CALIFORNIA I CEMENTING ArrARA'rUs Appncefia 'med July 18,

This invention relates to deep well drilling' equipment and particularly pertains to a well cementing apparatus of the type disclosed in' my prior patent, Number `1,,561,768 issued Nov. 17, 1925.

' The principal object of thel present invention is to provide a simple and effective device a of the character referred to, which is particularly adapted for use in shutting off inter-` ture serves as a receptacle'for holding cemen- I titious material dischargedfrom the cylinder until it sets, so that an effective barrier will be formed in the bore for the purpose of .shutting ofl' intermediate water. The cylinder is connected at its upper end to the casing by means of, a coupling :which includes a back pressure valve structure. At its lower end the cylinder isconnected to the casing by a coupling which is plugged. The 'purpose of this device is to permit cement to be'pumped directly down the casing through the check back pressure valve structure, and through the cylinder into the well bore where it will be supported by the basket, 'the back pressure valve acting to prevent the return of the cementitious material into the casing. One form which the invention may assume' is exem'plified in the following description and illustrated by way of example in the accompanying drawings, in which:

Fig. -1 is a View of a well bore in section 40 yillustrating my improved device therein.

Fig. 2 is a view in central Vertical section through my improved device.

Fig. 3 is a transverse section taken on line III-III of 2.

Referlr'ng more particularly to the accom- 1929. serial No. 877,982.

panying drawings, 10 indicates a cylinder whlch is lntended to be of the same diameter as the string of well casing 11 in which it is to be interposed. This cylinder is formed 'with a series of perforations 'or ports 12,

which are arranged in helical fashion around the cyllnder throughout the major portion of its length.

Secured about the outer periphery of the cylinder 10 is a semi-collapsible basket struc-v ture 11a. This basket structure com'prises'a plurality` of longitudinally extending yieldable arms 14=,^which are spaced apart with relation to each other around the cylinder and which are welded or otherwise secured at their lower ends to the cylinder.

The arms fiare'outwardly as they extend upwardly and carry an inverted frusto-conical bag 15, which may be made of canvas or any other suitable material. This bag extends completely around the cylinder and its lower end is of a diameter agreeing with the diameter of the cylinder and is tightly secured to the cylinder below the ports 12.

By referring to the drawings it will be seen that the outwardly flaring arms 14 will yieldably support the canvas bag, so that the bag will fill the space between the casing and the wall of the Well shaft. This bag acts as a packer or barrier for cementitious material pumped outwardly through the ports in the cylinder' into the canvas basket, so that the cementitious material will be supported in proper position in the well bore around the cylinder to shut off intermediate water. z

Due to its collapsibility, the basket formed around the cylinder'will fit the bore regardless of its diameter, providing however that the boreV is of no larger diameter than the diameter ofzthe basket when fully extended.

The upper end of the cylinder 10 is fitted with a cylindrical coupling 16 by means of which the cylinder may be connected to the upper portion of the string of well casing.

valve seat 20 formed at the lower end of a passageway 21, which extends from the valve Chamber 18 through the upper end of the plug.

` Extending from the lower end of the valve Chamber throu h the lower .end of the plug is a plurality o eccentrically positioned passageways 22. As these passageways 22 are located eccentrically the ball valve cannot close them. The ball valve 19 is buoyant so that after the cement has been pumped downwardly through the casing and out through the ports 12, when the pressure is relieved in the casing, the cement backing up in the cylinder causes the ball valve to rise and seat on the seat 20 so as to prevent the cement from returning into the casing.

A plug such as described is fully described and claimed in my Co-pending application entitled Floating, guiding and Cementing plug, Serial Number 235,204, filed November 23, 1927.

At its lower end the cylinder 10 is Connected to the lower string 11 by means o a coupling 28. This coupling is formed with a cementitious plug 24 which is cast directly therein, so as to normally prevent the passage of fiuid through the coupling from the cylinder. w

In operation of the device the point at which it is desired to cement is determined and the cylinder 10 is interposed in the string of casing at the proper distancefrom the end thereof, and the'casing is lowered in the hole. -When the string of casing is properly positionedin the bore, cement'is forced or pumped downwardly through the casing,.

which cementwill open `the valve 19 in the coupling 16, and `'will pass into the cylinder 10 and then discharge through the ports 12. As these ports 12 are arranged helically about the peri hery of the cylinder, the cement will evenly ischarge into the Canvas basket 15.' After the basket has been filled the cement will be forced upwardly around the casing until the operator determines that the proper shut-off has been efi'ected.

The cement in the cylinder cannotv back up in the casing, due to the provision of the back pressure valve structure in the coupling 16.

It is obviousthat the cement must pass through the ports 12 as it cannot pass through the coupling 23', due to the provision of the plug 24. When the cement has properly set, the drill is run down through the string of casing to drill out the back pressure valve structure in the couplingV 16, the cement remaining in the cylinder 10 and the plug 24 in the coupling 23.

It is desired to point out here that the ortion of the. casing.

back pressure valve structure in the coupling 16 and the plug 24 in the coupling '23 are entirely of non-metallic material, so

that drilling out may be accomplished very easily. This is particularly advantageous as no cast iron need be drilled through or broken up before the drilling may be proceeded with.

From the foregoin'g it is obvious that I have provided a simple and inexpensive de-g vice which may be eificiently used in shutting off intermediate water in a well bore, and while I have shown the preferred form of my invention, it is to be understood that various changes may be made in its structure by those skilled in the art without departing from the spirit of the invention, as defined in the appended claims.

Having thus described my invention, what I v claim and desire to secure by Letters Patent is:

1. In combination with a string of well casing, an elongated cylinder of substantially the same diameter as the well casing interposed between the ends thereof, an upper coupling connecting the upper end of the cylinder to the Well casing, a lower Coupling connecting the lower end of the cylinder to the well casing, a back pressure valve structure in the upper coupling, a plug in the lower coupling completely plugging the coupling preventing the passage of fiuid therethrough, said cylinder being formed with a plurality of spaced open orts arranged about the periphery thereo and ex- 100 tending through the wall of the cylinder intermediate the couplings.

2. In combination with a string -of well casing, an elongated cylinder of substantially the same diameter as the well casing 105 interposed between the ends thereof, an upper coupling connecting the upper end of the cylinder to the Well casing, a lower coupling connecting the lower end of the cylinder to the well casing, a back pressure valve 110 structure in the upper coupling, a plug in the lower coupling preventing the passage of fluid through lthe coupling, said cylinder being formed with a plurality of spaced ports arranged helically about the periphery Vterposed between the ends thereof, an u per coupling connecting the upper endo the cylinder to the well casing, a lower cou ling connecting the lower end of the cylin er to the well casing, a one way floating ball valve in the upler coupling, a solid cementitious plug in t e lower coupling, said cylinder havmg a plurality of lopen ports formed therein, and a contractile basket secured to the cylinder below said vports to retain cementitlous material discharged through said ports, said valve in the upper coupling being completely formed of friable material. REUBEN C. BKER. 

